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4x=(6x)(5x-14)
We move all terms to the left:
4x-((6x)(5x-14))=0
We calculate terms in parentheses: -(6x(5x-14)), so:We get rid of parentheses
6x(5x-14)
We multiply parentheses
30x^2-84x
Back to the equation:
-(30x^2-84x)
-30x^2+4x+84x=0
We add all the numbers together, and all the variables
-30x^2+88x=0
a = -30; b = 88; c = 0;
Δ = b2-4ac
Δ = 882-4·(-30)·0
Δ = 7744
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{7744}=88$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(88)-88}{2*-30}=\frac{-176}{-60} =2+14/15 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(88)+88}{2*-30}=\frac{0}{-60} =0 $
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